Erlang.h

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//===========================================================================
//===========================================================================


#ifndef __ERLANG_H
#define __ERLANG_H

#include "Rng/RandomVar.h"


//===========================================================================
class Erlang : public RandomVar< double >
{
public:

    Erlang(double mean = 0, double variance = 1);


    Erlang(double mean, double variance, RNG& r);


//========================================================================
    double mean() const
    {
        return pMean;
    }


//========================================================================
    double variance() const
    {
        return pVariance;
    }


//========================================================================
    void   mean(double newMean)
    {
        pMean     = newMean; setState();
    }


//========================================================================
    void   variance(double newVar)
    {
        pVariance = newVar;  setState();
    }


    double operator()(unsigned k, double a);

    double operator()();

    double p(const double&) const;

protected:

    double pMean;

    double pVariance;

private:

    // The distribution's parameter "k" (the order of the distribution)
    unsigned pK;

    // The distributions parameter "alpha" (the scale of the distribution)
    double   pA;

    // See "Erlang.cpp" for description.
    void setState();
};

#endif  /* !__ERLANG_H */